C:/xampp/htdocs/moodle/mod/folder/mod_form.php

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<?php

// This file is part of Moodle - http://moodle.org/
//
// Moodle is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Moodle is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.

defined('MOODLE_INTERNAL') || die();

require_once ($CFG->dirroot.'/course/moodleform_mod.php');

class mod_folder_mod_form extends moodleform_mod {
    function definition() {
        global $CFG;
        $mform = $this->_form;

        $config = get_config('folder');

        //-------------------------------------------------------
        $mform->addElement('header', 'general', get_string('general', 'form'));
        $mform->addElement('text', 'name', get_string('name'), array('size'=>'48'));
        if (!empty($CFG->formatstringstriptags)) {
            $mform->setType('name', PARAM_TEXT);
        } else {
            $mform->setType('name', PARAM_CLEANHTML);
        }
        $mform->addRule('name', null, 'required', null, 'client');
        $this->add_intro_editor($config->requiremodintro);

        //-------------------------------------------------------
        $mform->addElement('header', 'content', get_string('contentheader', 'folder'));
        $mform->addElement('filemanager', 'files', get_string('files'), null, array('subdirs'=>1, 'accepted_types'=>'*', 'return_types'=>FILE_INTERNAL));

        //-------------------------------------------------------
        $this->standard_coursemodule_elements();

        //-------------------------------------------------------
        $this->add_action_buttons();

        //-------------------------------------------------------
        $mform->addElement('hidden', 'revision');
        $mform->setType('revision', PARAM_INT);
        $mform->setDefault('revision', 1);
    }

    function data_preprocessing(&$default_values) {
        if ($this->current->instance) {
            // editing existing instance - copy existing files into draft area
            $draftitemid = file_get_submitted_draft_itemid('files');
            file_prepare_draft_area($draftitemid, $this->context->id, 'mod_folder', 'content', 0, array('subdirs'=>true));
            $default_values['files'] = $draftitemid;
        }
    }
}